Hyundai Nexo
Fuel cell drivetrain with electric motor. Impressive range, but hydrogen infrastructure and servicing costs are real considerations.
Hydrogen pioneer, future tech
The Nexo is a hydrogen pioneer — technically fascinating, but absolutely not a driving machine.
Engine Weaknesses 6
The stack failure rate on the Nexo is significant: over 50% of taxi fleet vehicles required stack replacement; for private vehicles over 20%. Hyundai launched an out-of-warranty compensation programme.
Symptoms: No power increase despite full throttle, intermittent deterioration, in the worst case no drive at all.
From August 2021 Hyundai recalled approximately 15,000 Nexo vehicles due to defective fuel cell stacks. Affected stacks had to be completely replaced.
Symptoms: Severe power loss, fuel cell warning light, vehicle only operates with restrictions
The complex energy management system of the Nexo, combining fuel cell, buffer battery, and electric motor, can show load distribution errors. Diagnostic faults considerably hamper troubleshooting at independent workshops.
Symptoms: Warning lights without clear defect, reduced power, unusual buffer battery recharging, limp mode.
The hydrogen refuelling network in Germany is extremely sparse and regularly breaks down. Station outages can leave Nexo drivers without their vehicle for days; not a technical weakness but a real daily-use problem.
Symptoms: No refuelling option, unplanned downtime, vehicle cannot be used despite being technically fault-free.
The Nexo shares the unexpected 12V battery drain problem known on Hyundai electric and fuel cell vehicles. Control units do not reliably exit standby.
Symptoms: Vehicle not ready to start after standing, all systems failed, no drive possible
Refuelling the Nexo requires 700 bar pressure and low temperature. After several consecutive refuelling events at one station, pressure is often insufficient.
Symptoms: Refuelling process aborts, range less than expected despite refuelling, error message at the pump
Vehicle Weaknesses 3
Hyundai recalled approximately 15,000 Nexo examples worldwide due to defective fuel cell stacks. Defective stacks can cause complete drivetrain failure. Repair costs outside warranty are very high.
Software problems manifest as malfunctions in driver assistance systems and inaccurate cockpit displays. Assistance systems switch themselves on or off unintentionally. Updates resolve some problems; others persist.
The hydrogen tank cannot be filled completely if the station has been used by multiple vehicles beforehand. The H2 compressed to 700 bar must first cool down before the tank can be fully refilled.
Reports & Tests
18 owner complaints filed with NHTSA (2018–2026). Most reported: Fuel System (10), Other (4), Engine (4).